Revenue recognition - Revenue by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 4,820,947	$ 4,674,811	$ 9,668,435	$ 8,907,586
North America
Disaggregation of Revenue [Line Items]
Revenues from contracts	3,234,158	3,079,738	6,527,249	5,914,658
Europe
Disaggregation of Revenue [Line Items]
Revenues from contracts	947,584	942,070	1,889,299	1,696,002
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts	583,920	599,135	1,138,325	1,187,533
Latin America
Disaggregation of Revenue [Line Items]
Revenues from contracts	$ 55,285	$ 53,868	$ 113,562	$ 109,393